[AMDGPU] NFC: Fixing small spelling errors in AMDGPU header files

[lamb-j]

Summary

Nonfunctional commit fixing several minor spelling errors in llvm/lib/Target/AMDGPU header files.
Testing workflow as a new contributor.

[lamb-j]

Adding clang-format to path for linting

[kerbowa]

LGTM

llvm/lib/Target/AMDGPU/AMDGPU.h

enum : unsigned {
     CONSTANT_ADDRESS = 4, ///< Address space for constant memory (VTX2).
     LOCAL_ADDRESS = 3,    ///< Address space for local memory.
     PRIVATE_ADDRESS = 5,  ///< Address space for private memory.
 
     CONSTANT_ADDRESS_32BIT = 6, ///< Address space for 32-bit constant memory.
 
     BUFFER_FAT_POINTER = 7, ///< Address space for 160-bit buffer fat pointers.
 
-    /// Address space for direct addressible parameter memory (CONST0).
+    /// Address space for direct addressable parameter memory (CONST0).
     PARAM_D_ADDRESS = 6,
-    /// Address space for indirect addressible parameter memory (VTX1).
+    /// Address space for indirect addressable parameter memory (VTX1).
     PARAM_I_ADDRESS = 7,
 
     // Do not re-order the CONSTANT_BUFFER_* enums.  Several places depend on
     // this order to be able to dynamically index a constant buffer, for
     // example:
     //
     // ConstantBufferAS = CONSTANT_BUFFER_0 + CBIdx
 

llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.h

public:
   void addCodeGenPrepare() override;
   bool addPreISel() override;
   bool addInstSelector() override;
   bool addGCPasses() override;
 
   std::unique_ptr<CSEConfigBase> getCSEConfig() const override;
 
   /// Check if a pass is enabled given \p Opt option. The option always
-  /// overrides defaults if explicitely used. Otherwise its default will
+  /// overrides defaults if explicitly used. Otherwise its default will
   /// be used given that a pass shall work at an optimization \p Level
   /// minimum.
   bool isPassEnabled(const cl::opt<bool> &Opt,
                      CodeGenOpt::Level Level = CodeGenOpt::Default) const {
     if (Opt.getNumOccurrences())
       return Opt;
     if (TM->getOptLevel() < Level)
       return false;
     return Opt;
   }
 };
 
 } // end namespace llvm
 
 #endif // LLVM_LIB_TARGET_AMDGPU_AMDGPUTARGETMACHINE_H

llvm/lib/Target/AMDGPU/GCNSchedStrategy.h

class GCNMaxOccupancySchedStrategy final : public GenericScheduler {
   unsigned VGPRCriticalLimit;
 
   unsigned TargetOccupancy;
 
   // schedule() have seen a clustered memory operation. Set it to false
   // before a region scheduling to know if the region had such clusters.
   bool HasClusteredNodes;
 
-  // schedule() have seen a an excess register pressure and had to track
+  // schedule() have seen an excess register pressure and had to track
   // register pressure for actual scheduling heuristics.
   bool HasExcessPressure;
 
   MachineFunction *MF;
 
 public:
   GCNMaxOccupancySchedStrategy(const MachineSchedContext *C);
 

llvm/lib/Target/AMDGPU/GCNSubtarget.h

public:
   }
 
   void ParseSubtargetFeatures(StringRef CPU, StringRef TuneCPU, StringRef FS);
 
   Generation getGeneration() const {
     return (Generation)Gen;
   }
 
-  /// Return the number of high bits known to be zero fror a frame index.
+  /// Return the number of high bits known to be zero for a frame index.
   unsigned getKnownHighZeroBitsForFrameIndex() const {
     return countLeadingZeros(MaxWaveScratchSize) + getWavefrontSizeLog2();
   }
 
   int getLDSBankCount() const {
     return LDSBankCount;
   }
 
bool d16PreservesUnusedBits() const {
     return hasD16LoadStore() && !TargetID.isSramEccOnOrAny();
   }
 
   bool hasD16Images() const {
     return getGeneration() >= VOLCANIC_ISLANDS;
   }
 
   /// Return if most LDS instructions have an m0 use that require m0 to be
-  /// iniitalized.
+  /// initialized.
   bool ldsRequiresM0Init() const {
     return getGeneration() < GFX9;
   }
 
   // True if the hardware rewinds and replays GWS operations if a wave is
   // preempted.
   //
   // If this is false, a GWS operation requires testing if a nack set the
bool hasNoDataDepHazard() const {
     return HasNoDataDepHazard;
   }
 
   bool vmemWriteNeedsExpWaitcnt() const {
     return getGeneration() < SEA_ISLANDS;
   }
 
   // Scratch is allocated in 256 dword per wave blocks for the entire
-  // wavefront. When viewed from the perspecive of an arbitrary workitem, this
+  // wavefront. When viewed from the perspective of an arbitrary workitem, this
   // is 4-byte aligned.
   //
   // Only 4-byte alignment is really needed to access anything. Transformations
   // on the pointer value itself may rely on the alignment / known low bits of
   // the pointer. Set this to something above the minimum to avoid needing
   // dynamic realignment in common cases.
   Align getStackAlignment() const { return Align(16); }
 

llvm/lib/Target/AMDGPU/R600InstrInfo.h

public:
   unsigned int getPredicationCost(const MachineInstr &) const override;
 
   unsigned int getInstrLatency(const InstrItineraryData *ItinData,
                                const MachineInstr &MI,
                                unsigned *PredCost = nullptr) const override;
 
   bool expandPostRAPseudo(MachineInstr &MI) const override;
 
-  /// Reserve the registers that may be accesed using indirect addressing.
+  /// Reserve the registers that may be accessed using indirect addressing.
   void reserveIndirectRegisters(BitVector &Reserved,
                                 const MachineFunction &MF,
                                 const R600RegisterInfo &TRI) const;
 
   /// Calculate the "Indirect Address" for the given \p RegIndex and
   /// \p Channel
   ///
   /// We model indirect addressing using a virtual address space that can be
-  /// accesed with loads and stores.  The "Indirect Address" is the memory
+  /// accessed with loads and stores.  The "Indirect Address" is the memory
   /// address in this virtual address space that maps to the given \p RegIndex
   /// and \p Channel.
   unsigned calculateIndirectAddress(unsigned RegIndex, unsigned Channel) const;
 
 
   /// \returns The register class to be used for loading and storing values
   /// from an "Indirect Address" .
   const TargetRegisterClass *getIndirectAddrRegClass() const;